Officers investigating the assault of a route 357 bus driver in Waltham Forest appealed for help in identifying the suspect.
A 24-year-old man handed himself in to police yesterday (Monday, 2 June) and was arrested on suspicion of assault occasioning actual bodily harm.
He remains in custody at an east London police station.
Officers from the joint Transport for London (TfL) and Metropolitan Police Service Safer Transport Command Workplace Violence Unit are dealing with the attack.
The incident occurred on Tuesday, 25 March at about 17.00hrs on a route 357 bus travelling on New Road to Hatch Lane, E4, when the victim, a 34-year-old man, was assaulted.